thin plate with long bending moment y

[A.bitter]

hi, once again I ask help to you, I have a problem with the structure present in the image (see attachment), regarding the modeling it was very simple, I modeled simply 1/4 of the latter using as element the shell to 8 knots, regarding the constraints I put a double symmetry "low and right" of my plate (as in the plot nodes) and the load, which must be a flender moment long y,

data:
d=50 (in the model obviously I put 25)
d=75 (...37.5)
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r=2.05
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